Translation of "to slay" into Spanish

It took almost a fortnight, but eventually I taught you the formulas to slay the algebraic beast.

Hizo falta casi una quincena, pero finalmente te enseñé las fórmulas para asesinar a la bestia algebraica.

It must have been a very powerful blade to slay the dead.

Debió ser una hoja muy poderosa para dar muerte a un muerto.

I was just trying to slay my demons, like you told me.

Solo estaba intentando matar mis demonios, como me dijiste.